Furnace.



M. l.. FOX.

FURNACE.

APPLICAION FiLED APH.15, |914. 11,154,502. Pafentedsept.. 21, 1915.

2 SHEETS-SHEE l.

W Z? 1 WW;

NI. 'L. FOX.

`FURNACE.

APPLICATION FILED APR. I5. I9I4.

Patented Sept. 21, 1915.

2 SHEETS-SHEET 2.

MAC L. FOX, 0F COLUMBIAVILLE, MICHIGAN.-

FURNACE.

Specication 'of Letters Patent.

)Patented Sept. 21, 1915..

Application filed April 15, 1914. Serial 1\T o. 832,075.

Be it known that I, MAC L. Fox, a citizen of the United States, residing at Columbiaville, in the county of Lapeei` and State of Michigan, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

This invention relates to a furnace, and

the principal object of the invention is to provide a furnace having an improved construction wliereby an asbestos cover may be applied to the casing surroundingthe firebox, and to also provide an improved type of outer casing through which the heated air pipes pass, the heated air pipes being provided With openings so that air between the two casings of the furnace m'ay be drawn out, thus preventing the accumulation of heated air between the casings of the furnace.

Another object of the invention is to so construct the outer casing that it may be readily dismounted, thus permitting access to the inner casing; and to so construct this outer casing that it may be readily applied to furnaces now in use, thus permitting the furnaces already installed to be provided with this improved structure.

This invention is illustrated in the accompanying drawings wherein- Figure 1 is a view in elevation of a furnace provided with the improved constructiongF ig. 2 is a transverse sectional .view taken along the line 2-2 of Fig. 1; Fig. 3 is a vertical sectional view through the furnace; Fig. d is a transverse sectional View taken along the line 1-1 of Fig. 1.

The body portion of this furnace is constructed very similar to furnaces now in use, and is intended to represent a conventional form of heated air furnace.

rJhe numeral indicates the fire-box which is supported by the base V11 andwhicli is inclosed by the casing 12 ,which is also supported by the base 11. This casing 12 is provided with the usual concave top 13 and is provided with openings so that the smoke pipe 14 may pass out through thecasing and so that the heated air pipes 15 may communicate with the upper portion of the hot air chamber. Around the casing 12 there is placed a covering 16 of asbestos which is packed into a holder formed of screening 16. This packing is placed about the casing 12, and is secured to the casing by any suitable means. 1t is not necessary to have the asbestos placed about the front of the furnace where the doors 17 and 18 are located, and therefore the packing. has not been shown extending entirely about the casing in Fig. 2. It does, however, extend entirely about the upper portion of the casing above the fire-box 10 since this portion of the casing 12 forms the chamber in which the heated air accumulates. The packing has therefore been shown extended entirely about the casing inFig. 4.

1 An outer casing indicated in general by A is placed about the asbestos covering, and is held in spaced relation theretoby means of the angle strips 19 which are secured to the inner face of the outer casing. lThe lower portion of this outer casing comprises the rear section 20 and side sections 21 which overlap the side portions of the rear section and have their forward portions bent inwardly as shown at 22 to engage the casing 12 and edges of the asbestos covering 16 and then have their edge portions 23 bent outwardly and secured to the angle strips 211 by means of rivets or other securing means the strips 24 being secured to the casing 12. Locking `bands rial are secured to angle strips 24C and tions secured beneath the pipe 14: by means of a bolt. in upper band or collar 2G is placed about the lower section of the outer casing, and has its end portions bent to form ears 2T through which the securing bolt 28 passes. rlhe free ends of the strips are connected in the sanie manner as the free ends of the collar 2G, but this can not be shown on the drawing since these ears would be positioned beneath the smoke pipe 14: shown in Figs. 2 and 4. The upper portion of the outer casing comprises two semithe lower portions of the circular sections 29 and 30 which are placedl about the upper portion of the furnace and are provided at their upperedges with inwardly-extending flanges 31 which engage the concave coveror top 13.

From an inspection of Fig. 3, it will be readilyT seen that a space is provided between the asbestos jacket and the outer casing which is open at its lower end, thus forming an air space through which air may circulate. The pipes 15 are provided with openings 32 permitting communication between the pipes 32 and the' air space between the outer casing and asbestos jacket. Thus the air in the space may be sucked into 25 formed of resilient matehave their free end porthe heated air pipes and cause a draft which will cause air to circulate in the air space and keep the asbestos cool. This will therefore greatly assist the asbestosin keeping the heat in the furnace and preventing it from radiating out into the furnace room. Thus all of the heat is taken up by the air in the upper portion of the inner casing l2 so that the air which passes into the heated air pipes will be very readily and quickly heated.

What is claimed is:

l. A furnace comprising a heater, an inner easing inclosing said heater and forming a hot air chamber, a heat insulating covering placed about said inner casing, an outer casing placed about said heat insulating covering and forming therewith an air space having a closed upper end and an open lower end, and pipes leading from said chamber through said heat insulating lcovering and outer casing and provided with openings communicating with the space between said insulating covering and outer casing.

2. A furnace comprising a heater, an inner casing inclosing said heater and forming a hot' air chamber7 hot air pipes leading from said chamber, an asbestos covering inclosing said inner casing, an outer casing inclosing said asbestos covering and Jforming therewith an air space having a closed upper end and open lower end, said hot air pipes being each provided with an opening communicating with said air space for permitting air in said space to be drawn into said hot air pipes to cause a circulation in the air space.

3. A furnace comprising a heater, an inner casing inclosing said heater and orming a hot air chamber, an outer casing placed about said inner casing and forming therewith an air space, having a closed upper' end and an open lower end, and hot air pipes leading from said inner casing through said outer casing, each of said pipes being provided with an opening communicating` with the space between said inner and outer casings.

In testimony whereof I affix my signature in presence of two witnesses. Y

Mao L. Fox.

lVitnesses D. H. BUTLER, R101-IARD LAMBERT. 

